Disk water-meter.



Patented June 10, I902.

W. H. LARRABEE DISK WATER METER.

(Application fllad Mar. 26, 1902.)

(No Model.)

, UNITED STATES PATENT OFFICE.

UNION WATER METER COMPANY, OF WORCESTER, A CORPORATION01+.MASSAOHUSETTS.

MASSACHUSETTS,

DISK WATER-METER.

SPECIFICATION forming part of Letters Patent No. 702,226, dated June 10,1902.

Application filed March 26, 1902. Serial No. 100,077. ,(No model.) 7

To all whom it may concern.-

Be it known that I, WILLIAM H. LARRABEE, a citizen of the United States,residing at Worcester, in the county of Worcester and State ofMassachusetts, have invented new and useful Improvements in Disk VVater-Meters, of which the following, together With the accompanying drawings,is a specification sufficiently full, clear, and exact to enable IOpersons skilled in the art to which this invention appertains to makeand use the same.

The invention relates to a novel construction of'the disk piston andchamber of a disk water-meter, also to the manner of introducing thefiow of water upon the disk-piston,

the objects being to provide a disk-piston having a greater proportionalleverage at certain portions thereof than at others and to render theaction more sensitiveand its opera- 50 tion more powerful for drivingthe register-- actuating gearing; also, to provide for the inflow ofwaterupon the disk-piston in a manner designed to avoid an excessofpressure being brought upon the point of the disk-pie: a 5 ton adjacentto the diaphragm and the liability of breaking the disk-plate at thepoints. To attain these objects, I have devised the improvements inconstruction explained in the following detailed descriptionandillustrated in the accompanying drawings, wherein- Figure 1 is anelevation view of such, portions of -a disk-piston meter as embody myinvention, the outer casing. being shown in section. Fig. 2 is ahorizontal part-sectional plan view. Fig. 3 is a plan View of thediskpiston separately. Referring to the drawings, the numeral 1indicates the outer casing of suitable construction, provided withwaterways I and E 40 for connection with the supply and delivery pipes.2 indicates the disk-chamber casing, formed of upper and lower sections,inclosing the disk-chamber C, and provided with an inlet-portt'andexit-port e. The bottom and top 5 of the chamber are of conoidal shape,with the usual bearing-sockets for supporting the bearing-ball 3 of thedisk-piston 5, and the chamber is provided with a radial uprightpartition or diaphragm 6, disposed between the ports 11 and e inwell-known manner. and ac- To further provide for the induction of thedisk-chamber casing, said member being the major axis 12 than forthequarters borpiston plate being greater in one direction than in adirection transverse thereto. This elliptical contour is preferablydisposed with the minor axis a or shorter diameter coinci- 6o dent withthe position of the diaphragm 6, while the major axis 1) or longerdiameter is transverse to the plane of the diaphragm or approximatelyinthat relation.

The differences between the length of the major axis band minor axis aof the disk-piston is preferably about one-sixth of the averagediameter, more or less, and the peripheral contourcanbe a true ellipseor formed on circular arcs struck from difierent centers to approximateelliptical form, as best shown in The disk piston may be of the usualhard rubber or other suitable material, with a plain diaphragm-receivingslot and mounted by its central bearing-ball for nutating ac- 7 5 tionwithin the'chamber. The stem or shaft 7 of the piston is journaled inits oblique relation in a rotatable member 10, that turns in a bearingrim or flange 8 upon the top of the adapted for maintaining the shaft 7and diskpiston at the proper degree of inclination and by means of apinor detent 9 thereon fortransmitting the power and motion to theregisteractuating devicesat D, which may be of wellknown construction.

The elliptical disk-piston and corresponding chamber afiord a greaterarea and leverage in the piston for the quarters bordering on 9o deringon the minor axis a, and it is designed that the inflow movement of thefluid or water shall thus be principally exerted at the increasedquarter oraposition on the disk at about P and its following area, whilethe point r is relieved, in'a measure, from an excess of the flowageforce. Hence the liability of fracture of the disk-plate by any quickpressure on point 'r is accordingly obviated.

. quarterP and to immediately act on the portion of the disk-pistonhaving the longer leverage by reason of-its elliptical form.

The exit-port e is preferably formed with an opening that is broadestadjacent to the diaphragm and tapering somewhat toward its oppositelimit. The length of the port e is shown as about half of its verticalbreadth, while the length of the port 2' exceeds its vertical breadth.(See Fig. 1.)

In the present instance the casing 2 is formed externally circular tofit a cylindrical opening 11 in the outer casing 1 and is provided withan upright barrier 12 between the port-s 'i and e and outside recesses13 and 14, that combine with and form portions of the waterways when thecasings are assembled.

It will be understood that I do not confine my invention of anelliptical piston-disk to the particular construction of casings andwaterways herein shown, as that feature may be employed in other outerform of easing without departure from the spirit thereof.

Iclaim as myinvention and desire to secure by Letters Patent 1. In adisk water-meter, a disk-piston of elliptical shape on its peripheralcontour in combination with a casing providedwith a correspondingelliptical disk-chamber, for the purpose setforth.

2. Inadisk action for watenmeters and the like, a disk-piston ofelliptical circumferential shape, andhavingthe diaphragm-slot thereincoincident with the minor axis; in combination with a disk-chambercasing having a chamber of corresponding elliptical shape on plan.

3. The dislcchamber casing having an inlet-port consisting of asubstantially triangular opening disposed with its broader spacefarthest from the diaphragm, and said opening tapering toward thediaphragm; in combination with the diaphragm, the nutating disk-pistonhavinga central bearing-ball, and a waterway leading to said inlet-port.

4. The disk-chamber casing having an inlet-port ithe opening of which iswidest near its forward end and converging toward the diaphragm, and anexit-port e the opening of which 'is widest adjacent to the diaphragm;in combination, with a disk-piston of approximately ellipticalperipheral contour, with the diaphragm-receiving slot at its minor axis.

5. The combination in a disk water-meter, of a casing having a chamberthe dimension of which is greater on a diameter transverse to thediaphragm than on the diameter coincident with the diaphragm, adiaphragm radially disposed in said chamber with inlet and outlet portsat the respective sides thereof, a disk-piston comprising a disk-plateof approximately elliptical peripheral contour, with a radial slot andaxial bearing-ball, a rotatable controlling member mounted in a bearingupon the casing, and the piston-shaft obliquely journaled in saidmember, and means for connecting said rotatable member with theregister-actuating devices.

6. The combination in a disk water-meter, of a disk-chamber casinginternally provided with a disk-chamber of elliptical or approximatelyelliptical shape on plan, the exterior of said casing being circular andprovided with recessed spaces and inlet and outlet ports, a disk-pistonof elliptical shape mounted for mutating action within said chamber, andan outer casing having a circular opening in which said disk-chambercasing fits, and provided with waterways that communicate with saidrecessed spaces, substantially as set forth.

Witness my hand this 22d day of March, 1902.

WVILLIAM H. LARRABEE.

